How do you investigate the rate of photosynthesis in pondweed?

Investigating the rate of photosynthesis

1. Set up the apparatus as in the diagram.
2. Leave for five minutes for the pondweed to acclimatise to the new light intensity.
3. Count the number of bubbles given off in one minute.
4. Move the light 10 cm further back.
5. Leave for five minutes for the pondweed to acclimatise again.

Why is pondweed used in photosynthesis experiments?

Like other green plants, pond weed can make sugar from carbon dioxide and water. Red light is more easily used by the pond weed than most other colours. This process of making sugar and oxygen is called photosynthesis. Pond weed uses the carbon dioxide which is dissolved in the water it is in.

How did you know the pondweed was doing photosynthesis?

The bubbles produced by pondweed can be counted and the rate of bubbling can serve as an indication of the rate of photosynthesis, or the gas can be collected in a pipette or microsyringe and the amount measured.

What is the photosynthesis equation?

The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.

What is the pondweed experiment?

Position the boiling tube so that the pondweed is 10 cm away from the light source. Allow the boiling tube to stand for five minutes. Count the number of bubbles emerging from the cut end of the stems in one minute. Repeat the experiment at different distances away from the light source.

What is the relationship between water light and Co2 and photosynthesis?

Light provides the energy for photosynthetic pigments to convert carbon dioxide (CO2) and water into sugars and oxygen. As light intensity increases Ð until a point Ð the amount of sugars increases and thus, more energy is available for plant growth and maintenance.

What are the 5 factors that affect photosynthesis?

The environmental factors which can affect the rate of photosynthesis are carbon dioxide, light, temperature, water, oxygen, minerals, pollutants and inhibitors. 1. Effect of Carbon dioxide: Being one of the raw materials, carbon dioxide concentration has great effect on the rate of photosynthesis.

What are the factors that can influence photosynthesis?

Three factors can limit the rate of photosynthesis: light intensity, carbon dioxide concentration and temperature.

• Light intensity. Without enough light, a plant cannot photosynthesise very quickly – even if there is plenty of water and carbon dioxide.
• Carbon dioxide concentration.
• Temperature.

What are the 7 steps of photosynthesis?

Terms in this set (7)

• Step 1-Light Dependent. CO2 and H2O enter the leaf.
• Step 2- Light Dependent. Light hits the pigment in the membrane of a thylakoid, splitting the H2O into O2.
• Step 3- Light Dependent. The electrons move down to enzymes.
• Step 4-Light Dependent.
• Step 5-Light independent.
• Step 6-Light independent.
• calvin cycle.

How to calculate the rate of photosynthesis in pondweed?

Leave for five minutes for the pondweed to acclimatise to the new light intensity. Count the number of bubbles given off in one minute. Move the light 10 cm further back. Leave for five minutes for the pondweed to acclimatise again. Count the number of bubbles given off in one minute.

Is the rate of photosynthesis slower in water?

Rates of photosynthesis can be slower in water, however, as the levels carbon dioxide dissolved in the water can be variable. This traditional experiment on the rates of photosynthsesis in aquatic plants compares three common species.

How does photosynthesis take place in a pond?

Photosynthesis in Ponds Plants in water need to photosynthesise just like those on land. Rates of photosynthesis can be slower in water, however, as the levels carbon dioxide dissolved in the water can be variable. This traditional experiment on the rates of photosynthsesis in aquatic plants compares three common species.

How is the rate of photosynthesis measured in an experiment?

In this experiment the rate of photosynthesis is measured by counting the number of bubbles rising from the cut end of a piece of Elodea or Cabomba. The work could be carried out individually or in groups of up to 3 students (counter, timekeeper and scribe).

https://www.youtube.com/watch?v=cBCKedXdFeE